Effect of temperature on atmospheric CH4 oxidation in soils

Abstract

Abstract: The research progresses in the effects of soil temperature on atmospheric CH₄ oxidation in soils were reviewed in this paper. Atmospheric CH₄ oxidation occurs in soils even if the temperature is very low. The atmospheric CH₄ oxidation rates are highly correlated with soil temperature, but not so closely as those of CH₄ production since methanotrophs have high affinity for CH₄ and low activation energy for CH₄ oxidation. As a result, the temperature effectiveness Q₁₀ is much smaller than that of CH₄ production. When the rates of CH₄ and O₂ diffusion from the atmosphere into the soil air are equal to those of CH₄ and O₂ consumption in soils, CH₄ oxidation rates in soils reach the maximum values at a given temperature which is called the optimal one. If the temperature continually rises and is higher than the optimal temperature, the reproduction and activity of methanotrophs in soils will gradually decrease because methanotrophs fail to compete with nitrifiers and other microbes for the limited oxygen in soil air. What we have proposed as above has successfully explained why soil temperature influencing the rate of atmospheric CH₄ oxidation shows the trend of increasing at first, then reaching the maximum and at last decreasing with temperature.

Key words: Phytase, Strain screening, Solid state fermentation, Optimal conditions of phytase-producing

CLC Number:

X511

DING Weixin, CAI Zucong. Effect of temperature on atmospheric CH₄ oxidation in soils[J]. cje, 2003, (3): 54-58.

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Effect of temperature on atmospheric CH₄ oxidation in soils

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